Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
  • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
  • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
  • B60T8/36—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force
  • B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
  • B60T8/363—Electromagnetic valves specially adapted for anti-lock brake and traction control systems in hydraulic systems
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
  • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
  • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
  • B60T8/36—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force
  • B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
  • B60T8/3675—Electromagnetic valves specially adapted for anti-lock brake and traction control systems integrated in modulator units
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/794—With means for separating solid material from the fluid
  • Y10T137/8122—Planar strainer normal to flow path

Definitions

• the invention relates to a solenoid valve according to the preamble of claim 1, which is provided for insertion into a receiving bore in a hydraulic block of a slip-controlled, hydraulic vehicle brake system.
• the solenoid valve is provided in particular as a wheel brake pressure reduction valve connected downstream of a wheel brake cylinder and interposed between the wheel brake cylinder and a suction side of a return pump.
• Such a solenoid valve is known from EP 0 675 030 A2.
• the known solenoid valve has a hollow cylindrical valve dome into which a cylindrical pole piece is inserted and in which an armature is axially displaceably received.
• the known solenoid valve is closed when de-energized, with its armature a valve closing body can be lifted off a valve seat against the force of a valve closing spring. If the known solenoid valve were designed as a normally open valve, the valve closing body with the armature could be pressed against the valve seat against the force of a valve opening spring.
• the valve seat is formed on a valve seat part which is arranged in alignment on an open end face of the valve dome.
• an annular valve carrier in which the valve dome engages with its open end face.
• a Coil placed on the valve dome.
• the solenoid valve is fastened in the receiving bore of the hydraulic block using a fastening plate in which a hole with the diameter of the valve dome is made, through which the valve dome is inserted, the fastening plate being clamped between the valve carrier and the coil.
• the mounting plate is attached to the hydraulic block and holds the solenoid valve on the valve carrier in the mounting hole.
• a sealing ring is inserted into a circumferential inner groove in the annular valve carrier.
• the seal between the valve carrier and a wall of the receiving bore is made with a sealing ring which lies in an annular step of the valve carrier.
• a sealing ring is also provided, which is inserted into a circumferential groove on the circumference of the valve seat part or a valve seat part holder, into which the valve seat part is pressed.
• a valve inlet takes place through radial bores which are provided in the valve carrier and in the valve seat part holder and open on an end face of the valve seat part facing the armature.
• the known solenoid valve has the disadvantage that its production is complex, since both the valve carrier and the valve seat part holder with their grooves and steps for the sealing rings and the transverse bores for the valve inlet have to be manufactured by machining, and that the assembly with the between the valve bracket and the coil clamped and to be attached to the hydraulic block mounting plate is expensive.
• the solenoid valve according to the invention with the features of claim 1 has the advantage that its valve support is formed without an undercut and can therefore be produced quickly and inexpensively by reshaping, for example by cold hammering.
• the connection of the valve dome to the valve carrier and preferably also the connection of the valve seat part to the valve dome or the valve carrier take place non-positively and / or positively, for example by pressing in and / or by a shaping process such as Flaring or caulking.
• This type of connection of the valve dome, the valve seat part and the valve carrier to one another also results in the sealing between these parts without a sealing element being necessary. This saves both the cost of the sealing element and the assembly effort for attaching the sealing element.
• Another advantage of the solenoid valve according to the invention is the possibility of being able to construct it in a short construction in the axial direction due to the connection and sealing of the valve dome, the valve seat part and the valve carrier.
• a valve inlet and a valve outlet take place, for example, axially or axially parallel through the open end face of the valve dome.
• Figure 1 shows an axial section of a solenoid valve according to the invention.
• Figure 2 is an enlarged detail view according to arrow II in Figure 1.
• the solenoid valve 10 according to the invention shown in the drawing is a rotationally symmetrical 2/2-way valve which is closed in its de-energized basic position. It is inserted into a stepped receiving bore 12 in a hydraulic block 14.
• the hydraulic block 14, of which in the drawing only a fragment is shown in the area of the receiving bore 12, is part of a slip control device of a vehicle brake system, not shown in the rest.
• further hydraulic components, not shown, such as solenoid valves and hydraulic pumps are inserted and hydraulically interconnected.
• the solenoid valve 10 has as valve dome 16 a cylindrical tube, one end end of which is closed with a solid, cylindrical pole piece 18, which is closed pressure-tight and fluid-tight with the valve dome 16 by a circumferential weld 20.
• a cylindrical armature 22 is then axially displaceably received in the valve dome 16 at the pole piece 18.
• a valve closing spring 24 in the form of a helical compression spring, which is inserted into an axial blind hole 26 in the armature 22, pushes the armature 22 away from the pole piece 18.
• the armature 22 is provided with continuous longitudinal grooves 23 which allow fluid to flow past in order to keep the movement resistance of the armature 22 low when the solenoid valve 10 is actuated.
• valve dome 16 expands with an annular step 30 produced by reshaping.
• a valve seat part 32 is arranged in the open end face 28 of the valve dome 16.
• the valve seat part 32 is cylindrical with a considerably smaller diameter than the valve dome 16. It is pressed into a perforated disk-shaped valve seat part holder 34 which lies in the annular step 30 on the open end face 28 of the valve dome 16.
• the valve seat part holder 34 is held with the valve seat part 32 in the open end face 28 of the valve dome 16 by an obliquely inwardly directed flange 36 on the open end face 28 of the valve dome 16.
• the perforated disk-shaped valve seat part holder 34 is an easily manufactured, inexpensive standard part.
• the valve seat part 32 is provided with an axial through hole 38, which has a constriction as a throttle point 40 at an end facing the armature 22 and opens out with a conical valve seat 42 towards the armature 22.
• the through hole 38 with the throttle point 40 forms a valve outlet.
• the Valve seat part 32 has no undercut, it is produced quickly and inexpensively by cold hammering, that is to say by a forming process.
• the valve seat 42 can be embossed after cold hammering in order to solidify the material and increase its wear resistance.
• the valve seat part 32 can also be produced in one piece with the valve seat part holder 34.
• the armature 22 tapers with two ring steps.
• a hardened ball is pressed as a valve closing body 46, which cooperates with the valve seat 42.
• the armature 22 is pressed with the valve closing body 46 pressed into it by the valve closing spring 24 against the valve seat 42, i. H. the magnetic valve 10 is closed in its de-energized basic position.
• a coil 48 enclosing the valve dome 16 and the pole piece 18 is pushed onto the magnetic valve 10.
• the armature 22 is attracted to the pole piece 18 against the force of the valve closing spring 24 and in this way the valve closing body 46 is lifted from the valve seat 42, the solenoid valve 10 is open in its energized switching position.
• the coil 48 is encapsulated with a plastic insulator 50 and inserted into a cup-shaped yoke 52, which closes a magnetic circuit of the solenoid valve 10 at a free end face of the pole piece 18.
• a yoke disk 54 with a central hole 56 is inserted, which is penetrated by the valve dome 16. With the yoke disk 54, the magnetic circuit of the solenoid valve 10 is also largely closed on the armature 22 side.
• the perforated disk-shaped valve seat part holder 34 has a longitudinal groove 37 which is parallel to the axis and is part of a valve inlet at one point on its inner circumference, that is to say on the outer circumference of the valve seat part 32.
• Valve inlet 37 and valve outlet 38, 40 thus take place through the open end face 28 of the valve dome 16, so that no transverse hole in the peripheral wall of the valve dome 16 or in another Part of the solenoid valve 10 is necessary for the valve inlet or outlet, which facilitates the manufacture of the solenoid valve 10.
• the solenoid valve 10 has an annular valve carrier 58 which is attached to the valve dome 16.
• the valve support 58 has an annular step 60 on its inside, in which the annular step 30 of the valve dome 16 and in this the valve seat part holder 34 lie.
• These parts are mechanically connected to one another and sealed pressure-tight by a press fit between the valve support 58, the enlarged end of the valve dome 16 and the valve seat part holder 34. There is therefore a frictional connection between the valve carrier 58, the valve dome 16 and the valve seat part holder 34.
• valve dome 16 and the valve seat part holder 34 can be brought about by pressing the valve carrier 58 onto the valve dome 16, so it does not necessarily have to be a press fit exist between the valve seat part holder 34 and the valve dome 16 as long as the valve carrier 58 has not yet been pressed on.
• a circumferential caulking 62 of the valve carrier 58 improves the mechanical connection and the pressure-tight seal between the valve carrier 58, the valve dome 16 and the valve seat part holder 34.
• the caulking 62 additionally brings about a positive connection for the frictional connection.
• valve support 58 On its outer circumference, the valve support 58 also has an annular step 64, on which it and together with it the entire solenoid valve 10 are held and sealed pressure-tight by a circumferential caulking 66 of the hydraulic block 14 in the receiving bore 12 of the hydraulic block 14.
• Caulking 66 is applied before the coil 48 with the yoke 52 is attached to the valve dome 16 and the pole piece 18.
• the valve seat part 32 protrudes on a side facing away from the armature 22 from the valve seat part holder 34 into an axial outlet bore 68 in the hydraulic block 14.
• a filter element 70 is arranged on a base of the stepped receiving bore 12, which has the shape of a perforated disk 70, which surrounds the valve seat part 32 protruding from the valve seat part holder 34 and which, for example, consists of a filter fabric or a perforated filter screen consists.
• the filter element 70 is partially extrusion-coated with a thermoplastic plastic, to which approximately 20% glass or carbon fiber is preferably added.
• the filter element 70 lies in a flat countersink of the valve carrier 58.
• the thermoplastic material of the filter element 70 fulfills several sealing functions: On the one hand, the thermoplastic material is designed as a sealing ring 72 on the outer circumference of the filter element 70. Furthermore, the thermoplastic plastic forms an annular sealing element 74 on the inner circumference of the perforated disk-shaped filter element 70.
• This annular sealing element 74 which surrounds the valve seat part 32, has a U-shaped ring cross section, the open side of which faces the valve seat part holder 34 and the closed yoke side of which faces away from the valve seat part holder 34 is, so that an interior of the U-shaped ring cross section of the sealing element 74 is acted upon by a fluid pressure prevailing in the valve inlet.
• An inner leg 76 of the U-shaped ring cross section lies sealingly on the outside on the valve seat part 32, and an outer leg 78 of the U-shaped ring cross section of the sealing element 74 lies inside on a peripheral wall of the stepped receiving bore 12 of the hydraulic block 14.
• valve is admitted through a radial inlet bore 80, which leads to the filter element 70, further through the filter element 70 and through one or more radial grooves 82 in the sealing element 74, which form throttling points, and through the longitudinal groove 37 of the valve seat part holder 34 into the interior of the valve dome 16.

Landscapes

• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Engineering & Computer Science (AREA)
• Fluid Mechanics (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Magnetically Actuated Valves (AREA)
• Regulating Braking Force (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7858385

Family Applications (1)

Country Status (5)

Cited By (6)

Families Citing this family (29)

Citations (7)

Family Cites Families (3)

• 1998
  • 1998-02-20 DE DE19807130A patent/DE19807130A1/de not_active Withdrawn
  • 1998-11-18 EP EP98966150A patent/EP1056631B1/de not_active Expired - Lifetime
  • 1998-11-18 JP JP2000532320A patent/JP4436967B2/ja not_active Expired - Fee Related
  • 1998-11-18 WO PCT/DE1998/003400 patent/WO1999042348A1/de not_active Ceased
  • 1998-11-18 US US09/622,647 patent/US6405752B1/en not_active Expired - Lifetime
  • 1998-11-18 DE DE59805854T patent/DE59805854D1/de not_active Expired - Lifetime

Patent Citations (7)

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